Home / 15,720.31-21,696.15-14,391.64

Finding the Fourth Proportional to 15,720.31, 21,696.15 and 14,391.64

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Solution

The fourth proportional to 15,720.31, 21,696.15 and 14,391.64 is: 19,862.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,720.31 : 21,696.15 = 14,391.64 : x
  2. Step 2: Convert to fraction form
    15,720.31/21,696.15 = 14,391.64/x
  3. Step 3: Cross multiply
    15,720.31x = 21,696.15 × 14,391.64
  4. Step 4: Simplify right side
    15,720.31x = 312,243,180.19
  5. Step 5: Solve for x
    x = 312,243,180.19/15,720.31
  6. Step 6: Final answer
    x = 19,862.41

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.